package com.geeksaga.filter;

import java.io.IOException;
import java.util.Enumeration;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * @author newbie
 * @since 0.1
 */
public class EncodingFilter implements Filter {

	protected static final Log logger = LogFactory.getLog(EncodingFilter.class);
	private String encoding = null;
    protected FilterConfig filterConfig = null;
    
    /* (non-Javadoc)
     * @see javax.servlet.Filter#destroy()
     */
    public void destroy() {
        this.encoding = null;
        this.filterConfig = null;
    }

    /* (non-Javadoc)
     * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
     */
    @SuppressWarnings("unchecked")
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
            ServletException {

        if (request.getCharacterEncoding() == null)
            if (encoding != null)
                request.setCharacterEncoding(encoding);
        
		Enumeration<String> enumeration = request.getParameterNames();
		while (enumeration.hasMoreElements()) {
			String param = enumeration.nextElement();
			String value = request.getParameter(param);
			
			logger.info(param + " : " + value);
		}        
        
        chain.doFilter(request, response);
    }

    /* (non-Javadoc)
     * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
     */
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
    }
}